The fresher the coffee ground the better. If the coffee ground is old and moldy, you will need to pasteurize or sterilize it depending on your growing setup. If you don't "clean" the moldy coffee ground, you will notice a multitude of different fungi and bacteria growing on your King Oyster mycelium...not a pretty sight! Even though many cultivators allow contaminations, we prefer to keep them out completely.
After testing ten different proven substrates with every culture we isolate, our findings show that best ingredients for growing Oyster mushrooms are: wheat straw, fine hardwood chip, coffee grounds and bran.
The grow bags that we provide have our own unique filter. We have tried using smaller bags and thus far, this bag works best.
200g of King Oyster spawn is enough to inoculate 2kgs of coffee grounds.
As mentioned above, this method is for home use only.
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